how is a corrugated bulkhead construted?

CORRUGATED BULKHEADS
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In setting the more recently adopted type of corrugated bulkheads, as
in Fig. 9, the drawing must be consulted for location of frame line.
Here the moulded line may be on either the face side or the stiffener
side of the bulkhead, at the extreme width of the web bulkhead
stiffeners. In this type of corrugated bulkhead, the depth of the
corrugations varies at different heights on the bulkhead. The deeper
corrugations at the bottom supply the increased bulkhead stiffness
which is required owing to greater pressure of water (or other liquid)
in the lower part of the tank.

Fig. 9 Illustration:
http://www.purgit.com/fig_09.jpg